Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Apr. 01, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 23,858	$ 23,747
Accounts receivable, net of allowance for doubtful accounts of $240 as of April 1, 2017 and $230 as of December 31, 2016	8,866	10,025
Inventories	11,728	11,643
Prepaid expenses and other current assets	568	450
Total current assets	45,020	45,865
Property and equipment, net	1,672	1,534
Intangible assets, net	128	132
Goodwill	533	533
Other long-term assets	75	80
Total assets	47,428	48,144
Current liabilities:
Accounts payable	1,944	1,994
Accrued compensation	1,569	2,346
Accrued expenses	1,646	2,135
Accrued warranty	649	603
Deferred revenue	1,361	1,383
Total current liabilities	7,169	8,461
Long-term liabilities:
Other long-term liabilities	415	523
Total liabilities	7,584	8,984
Stockholders’ equity:
Preferred stock, $0.01 par value, 2,000,000 shares authorized, no shares issued and outstanding
Common stock, $0.01 par value: Authorized: 30,000,000 shares; Issued and outstanding 11,542,653 and 11,304,736 shares as of April 1, 2017 and December 31, 2016, respectively	126	124
Additional paid-in capital	57,706	55,158
Accumulated deficit	(17,988)	(16,122)
Total stockholders’ equity	39,844	39,160
Total liabilities and stockholders’ equity	$ 47,428	$ 48,144